530772

Appears in sequences

• exp(arcsin(x)-tanh(x))=1+3/3!*x^3-7/5!*x^5+90/6!*x^6+497/7!*x^7...at n=12A013421
• cosh(arcsin(x)-tanh(x))=1+90/6!*x^6-1176/8!*x^8+185094/10!*x^10...at n=6A013427
• a(0)=1; a(1)=1; a(n)= a(n-1) + floor(sqrt(a(n-1)*a(n-2))) + floor(sqrt(a(n-3)*a(n-4))) + ....at n=21A043328
• Number of tripling steps to reach 1 in the 3x+1 (Collatz) problem starting with the n-th Mersenne prime.at n=28A390817